Plasma cutting straight bar multi-parallel control system and control method

Abstract

The invention provides a plasma cutting straight strip multi-parallel control system and method, and belongs to the technical field of plasma cutting. The control system comprises a CNC host, a plasma cutting unit, a multi-parallel straight strip cutting system and a plasma height adjusting controller. The multi-parallel straight strip cutting system is used for acquiring the on-off state of at least one plasma cutting machine in the plasma cutting unit and sending a control signal to the CNC host based on the on-off state; the CNC host is used for controlling the walking cutting state of the plasma cutting unit based on a control signal sent by the multi-parallel straight strip cutting system; and the plasma heightening controller is used for controlling the height of a cutting gun head of a plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC. The multiple straight strip cutting systems are connected with the multiple plasma cutting machines, so that the multiple plasma cutting machines can be simultaneously controlled to synchronously perform cutting motion, the cutting efficiency is effectively improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plasma cutting, and in particular to a plasma cutting straight strip multi-parallel control system and a control method. Background Art

[0002] Plasma cutting is a processing method that uses compressed plasma arc to cut metal. Its characteristics are: high production efficiency, narrow cutting seam, smooth cutting surface, small thermal deformation of workpiece, no need for preheating, no need for combustible gas, etc. It is now widely used in the cutting of metal sheets. Plasma cutting straight bar is a special straight bar cutting equipment. At present, the market uses one equipment to cut steel. The operating efficiency of one equipment is extremely low. In the traditional cutting mode, it takes more than one hour to cut a plate, and the failure cannot be fed back to the CNC in time.

[0003] The above problems need to be solved urgently. Summary of the invention

[0004] The present invention aims to overcome at least one of the above-mentioned disadvantages of the prior art. On the one hand, a plasma cutting straight strip multi-parallel control system is provided, the control system comprising: a CNC host, a plasma cutting unit, a multi-parallel straight strip cutting system and a plasma height adjustment controller, the plasma cutting unit comprising at least one plasma cutting machine; the multi-parallel straight strip cutting system is bidirectionally electrically connected to the plasma cutting unit, for obtaining the on-off state of at least one plasma cutting machine in the plasma cutting unit, and sending a control signal to the CNC host based on the on-off state; the first input end of the CNC host is connected to the first output end of the multi-parallel straight strip cutting system, the first output end of the CNC host is electrically connected to the input end of the plasma cutting unit, for controlling the walking cutting state of the plasma cutting unit based on the control signal sent by the multi-parallel straight strip cutting system; the input end of the plasma height adjustment controller is electrically connected to the second output end of the CNC host, the output end of the plasma height adjustment controller is bidirectionally electrically connected to the plasma cutting unit, for controlling the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC.

[0005] Furthermore, the multi-parallel straight strip cutting system integrates an arc switching circuit, a current control circuit and a multi-parallel logic control circuit; the input end of the arc switching circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group, so as to obtain the arc striking current of the at least one plasma cutting machine; the input end of the current control circuit is electrically connected to the output end of the arc switching circuit, and the output end of the current control circuit is electrically connected to the input end of the plasma cutting group, so as to control the current released by at least one plasma cutting machine in the plasma cutting group to reach a preset current based on the electrical signal sent by the arc switching circuit; the input end of the multi-parallel logic control circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group, and the output end of the multi-parallel logic control circuit is connected to the input end of the CNC host and the plasma height adjustment controller, so as to generate a control signal based on the feedback signal of at least one plasma cutting machine in the plasma cutting group and send it to the CNC host and the plasma height adjustment controller respectively.

[0006] Furthermore, the multi-parallel logic control circuit is also used to: when the signals received from at least one plasma cutting machine are all high-level signals, generate a first control signal and send it to the CNC host and the plasma height adjustment controller respectively; when there is a low-level signal in the signals received from at least one plasma cutting machine, generate a second control signal and send it to the CNC host and the plasma height adjustment controller respectively.

[0007] Furthermore, the CNC host controls at least one plasma cutting machine in the plasma cutting group to be in a walking and cutting state at the same time based on the first control signal; the plasma height adjustment controller receives the cutting gun voltage of at least one plasma cutting machine in the plasma cutting group based on the first control signal, and controls the height of the cutting gun based on the voltage; the CNC host controls at least one plasma cutting machine in the plasma cutting group to be in a non-walking and cutting state at the same time based on the second control signal; the plasma height adjustment controller puts it in a non-working state based on the second control signal.

[0008] Furthermore, the multi-parallel logic control circuit is used to generate control signals based on the on-off signal fed back by at least one plasma cutting machine in the plasma cutting machine group through AND or digital logic control, and send them to the CNC host and the plasma height adjustment controller respectively.

[0009] Furthermore, the control system also includes a material table, and the third output terminal of the CNC host is electrically connected to the material table, and is used to control the workpiece to be processed on the material table based on the control signal sent by the multi-strip cutting system.

[0010] Furthermore, the arc switching circuit includes a first operational amplifier U1A, a second operational amplifier U1B, a first transistor Q1, a second relay KD2 and a second indicator LED2, the positive input end of the first operational amplifier U1A is connected to at least one plasma cutting machine through a first resistor R1, the reverse input end of the first operational amplifier U1A is connected between the output end of the first operational amplifier U1A and the second resistor R2, the first capacitor C1 is connected in parallel to the output end of the first operational amplifier U1A, and the output end of the first operational amplifier U1A is connected through the second resistor R2 It is connected to the positive input terminal of the second operational amplifier U1B, the reverse input terminal of the second operational amplifier U1B is connected to the +15V voltage through the third resistor R3, the output terminal of the second operational amplifier U1B is connected to the base of the first transistor Q1 through the fifth resistor R5, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the second relay KD2, the second relay KD2 is connected to the +15V voltage via the seventh resistor R71, one end of the eighth resistor R8 is connected between the seventh resistor R71 and the +15V voltage, and the other end is connected to the second indicator LED2.

[0011] Furthermore, the current control circuit includes an optocoupler U2, a second transistor Q2, a first relay KD1 and a first indicator light LED1, the first pin of the optocoupler U2 is connected to a +15V voltage through a ninth resistor R9, the second pin is connected to the output end of the arc circuit, the fourth pin is connected to the +15V voltage, the third pin is connected to the base of the second transistor Q2 through a tenth resistor R10, the collector of the second transistor Q2 is connected to the first relay KD1, the emitter of the second transistor Q2 is grounded, the first relay KD1 is connected in parallel with the third diode D3, the first relay KD1 is connected to a +15V voltage via a twelfth resistor R121, one end of the thirteenth resistor is connected between the twelfth resistor R121 and the +15V voltage, and the other end is connected to the first indicator light LED1, and the other end of the first indicator light LED1 is grounded.

[0012] Furthermore, the multi-parallel logic control circuit includes N signal receiving circuits, N digital chips and a signal generating circuit, wherein the first signal receiving circuit and the second signal receiving circuit are connected to the input end of the first digital chip, and the output ends of the N digital chips are connected to the signal generating circuit; the signal receiving circuit includes an inverter, a third transistor Q3 and a third indicator light LED3, and the signal generating circuit includes a third relay J1, a fourth transistor Q4 and a non-inverting buffer.

[0013] In the second aspect, the present invention provides a plasma cutting straight bar multi-parallel control method, which is applied to the above-mentioned plasma cutting straight bar multi-parallel control system, and the method includes: obtaining the on and off status of at least one plasma cutting machine in the plasma cutting group through the multi-parallel straight bar cutting system, and sending a control signal to the CNC host based on the on and off status; the CNC host controls the walking and cutting state of the plasma cutting group based on the control signal sent by the multi-parallel straight bar cutting system; the plasma height adjustment controller controls the height of the cutting gun head of the plasma cutting machine in the plasma cutting group based on the control signal sent by the CNC.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a plasma cutting straight strip multi-parallel control system, the control system comprising: a CNC host, a plasma cutting unit, a multi-parallel straight strip cutting system and a plasma height adjustment controller, the plasma cutting unit comprising at least one plasma cutting machine; the multi-parallel straight strip cutting system is bidirectionally electrically connected to the plasma cutting unit, for obtaining the on / off state of at least one plasma cutting machine in the plasma cutting unit, and sending a control signal to the CNC host based on the on / off state; the first input end of the CNC host is connected to the first output end of the multi-parallel straight strip cutting system, the first output end of the CNC host is electrically connected to the input end of the plasma cutting unit, for controlling the walking cutting state of the plasma cutting unit based on the control signal sent by the multi-parallel straight strip cutting system; the input end of the plasma height adjustment controller is electrically connected to the second output end of the CNC host, the output end of the plasma height adjustment controller is bidirectionally electrically connected to the plasma cutting unit, for controlling the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC. By connecting the multi-parallel straight-strip cutting system to multiple plasma cutting machines, multiple plasma cutting machines can be controlled to perform cutting movements synchronously, thus avoiding the problem of low cutting efficiency in the prior art, effectively improving cutting efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the structure of a plasma cutting straight strip multi-control system provided in Example 1 of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of a multi-strip cutting system provided in Example 1 of the present invention.

[0018] Figure 3 This is a topological diagram of an arc switching circuit provided in Example 1 of the present invention.

[0019] Figure 4 This is a current control circuit topology diagram provided in Example 1 of the present invention.

[0020] Figure 5 This is a topological diagram of a multi-parallel logic control circuit provided in Example 1 of the present invention.

[0021] Figure 6 This is a flow chart of a plasma cutting straight strip multi-control method provided in Example 2 of the present invention.

[0022] Figure 7 This is a partial block diagram of an electronic device provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0023] It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations as sequential processes, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0024] It should be understood that, although the terms "first", "second", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another unit. For example, without departing from the scope of the exemplary embodiments, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit. The term "and / or" used herein includes any and all combinations of one or more of the listed associated items.

[0025] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0026] Example 1

[0027] like Figure 1 The figure shows a schematic diagram of the structure of a plasma cutting straight strip multi-control system provided by the present invention.

[0028] As an example, the control system includes: a CNC host 1, a plasma cutting unit 2, a multi-strip cutting system 3 and a plasma height adjustment controller 4, wherein the plasma cutting unit 2 includes at least one plasma cutting machine; the multi-strip cutting system 3 is bidirectionally electrically connected to the plasma cutting unit 2, and is used to obtain the on / off state of at least one plasma cutting machine in the plasma cutting unit 2, and send a control signal to the CNC host 1 based on the on / off state; an input end of the CNC host is connected to a first output end of the multi-strip cutting system 3 The first output end of the CNC host 1 is electrically connected to the input end of the plasma cutting unit 2, and is used to control the walking and cutting state of the plasma cutting unit 2 based on the control signal sent by the multi-strip cutting system 3; the input end of the plasma height adjustment controller 4 is electrically connected to the second output end of the CNC host 1, and the output end of the plasma height adjustment controller 4 is bidirectionally electrically connected to the plasma cutting unit 2, and is used to control the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit 2 based on the control signal sent by the CNC host 1.

[0029] Preferably, Figure 2 As shown, the multi-parallel straight strip cutting system 3 integrates an arc switching circuit 310, a current control circuit 320 and a multi-parallel logic control circuit 330; the input end of the arc switching circuit 310 is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting unit 2, so as to obtain the arc striking current of the at least one plasma cutting machine; the input end of the current control circuit 320 is electrically connected to the output end of the arc switching circuit 310, and the output end of the current control circuit 320 is electrically connected to the input end of the plasma cutting unit 2, so as to obtain the arc striking current of the at least one plasma cutting machine based on the arc switching circuit 3 The electrical signal sent by 10 controls the current released by at least one plasma cutting machine in the plasma cutting group 2 to reach a preset current; the input end of the multi-parallel logic control circuit 330 is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group 2, and the output end of the multi-parallel logic control circuit 330 is connected to the input end of the CNC host 1 and the plasma height adjustment controller 4, and is used to generate a control signal based on the feedback signal of at least one plasma cutting machine in the plasma cutting group 2 and send it to the CNC host 1 and the plasma height adjustment controller 4 respectively.

[0030] Preferably, the multi-parallel logic control circuit 330 is also used for: when the signals fed back by at least one plasma cutting machine received are all high-level signals, generating a first control signal and sending it to the CNC host and the plasma height controller respectively; when there is a low-level signal in the signals fed back by at least one plasma cutting machine received, generating a second control signal and sending it to the CNC host 1 and the plasma height controller 4 respectively. The CNC host 1 controls at least one plasma cutting machine in the plasma cutting group 2 to be in a walking cutting state at the same time based on the first control signal; the plasma height controller 4 receives the cutting gun voltage of at least one plasma cutting machine in the plasma cutting group based on the first control signal, and controls the height of the cutting gun based on the voltage; the CNC host 1 controls at least one plasma cutting machine in the plasma cutting group to be in a non-walking cutting state at the same time based on the second control signal; the plasma height controller is placed in a non-working state based on the second control signal. Specifically, the multi-parallel logic control circuit 330 uses digital logic control "AND" and "OR" to complete the parallel system control. The basic logic is that if one group is abnormal, the output signal is a fault signal. When the parallel equipment is cutting normally and all logics are "1", the signal fed back to the CNC host 1 is "1". The CNC host 1 starts to control at least one plasma cutting machine in the plasma cutting group to travel and cut according to the feedback signal. And, at the same time, the plasma height controller 4 is controlled to start working.

[0031] Preferably, the multi-parallel logic control circuit 330 is used to generate control signals based on the on-off signal fed back by at least one plasma cutting machine in the plasma cutting unit 2 through AND or digital logic control, and send them to the CNC host 1 and the plasma height controller 4 respectively. Specifically, the electrical signal fed back by the plasma cutting unit 2 to the multi-parallel logic control circuit 330 is an on-off signal, that is, only when all the plasma cutting machines in the plasma cutting unit 2 are in normal working state, the multi-parallel logic control circuit 330 will send the first control signal back to the CNC host 1, so that the CNC host 1 controls the plasma cutting machines in the plasma cutting unit 2 to be in the walking cutting state, and the plasma height controller 4 is in the working state. The adoption of this solution not only improves the working efficiency of plasma cutting, but also enables the fault information of the plasma cutting machine to be effectively fed back to the CNC host 1.

[0032] Preferably, the control system further includes a material table 5, and the third output terminal of the CNC host 1 is electrically connected to the material table 5, and is used to control the workpiece to be processed on the material table 5 based on the control signal sent by the multi-strip cutting system 3. That is, when the CNC host 1 receives the first control signal, the material table 5 is synchronously controlled.

[0033] Preferably, Figure 3As shown, the arc switching circuit 310 includes a first operational amplifier U1A, a second operational amplifier U1B, a first transistor Q1, a second relay KD2 and a second indicator LED2. The positive input end of the first operational amplifier U1A is connected to at least one plasma cutting machine through a first resistor R1. The reverse input end of the first operational amplifier U1A is connected between the output end of the first operational amplifier U1A and the second resistor R2. The first capacitor C1 is connected in parallel to the output end of the first operational amplifier U1A. The output end of the first operational amplifier U1A is connected through the second resistor R 2 is connected to the positive input terminal of the second operational amplifier U1B, the reverse input terminal of the second operational amplifier U1B is connected to the +15V voltage through the third resistor R3, the output terminal of the second operational amplifier U1B is connected to the base of the first transistor Q1 through the fifth resistor R5, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the second relay KD2, the second relay KD2 is connected to the +15V voltage via the seventh resistor R71, one end of the eighth resistor R8 is connected between the seventh resistor R71 and the +15V voltage, and the other end is connected to the second indicator LED2.

[0034] Preferably, Figure 4 As shown, the current control circuit includes an optical coupler U2, a second transistor Q2, a first relay KD1 and a first indicator light LED1, the first pin of the optical coupler U2 is connected to a +15V voltage through a ninth resistor R9, the second pin is connected to the output end of the arc circuit, the fourth pin is connected to the +15V voltage, the third pin is connected to the base of the second transistor Q2 through a tenth resistor R10, the collector of the second transistor Q2 is connected to the first relay KD1, the emitter of the second transistor Q2 is grounded, the first relay KD1 is connected in parallel with the third diode D3, the first relay KD1 is connected to a +15V voltage via a twelfth resistor R121, one end of the thirteenth resistor is connected between the twelfth resistor R121 and the +15V voltage, the other end is connected to the first indicator light LED1, and the other end of the first indicator light LED1 is grounded.

[0035] Preferably, Figure 5 As shown, the multi-parallel logic control circuit includes N signal receiving circuits, N digital chips and a signal generating circuit, wherein the first signal receiving circuit and the second signal receiving circuit are connected to the input end of the first digital chip, and the output ends of the N digital chips are connected to the signal generating circuit; the signal receiving circuit includes an inverter, a third transistor Q3 and a third indicator LED3, and the signal generating circuit includes a third relay J1, a fourth transistor Q4 and a non-inverting buffer. Specifically, Figure 4In the figure, a plasma cutting machine group 2 including 10 plasma cutting machines is taken as an example, that is, it includes 10 signal receiving circuits and 10 digital chips, and the digital chip model is CD4081, wherein the 10 signal receiving circuits are connected in parallel, and every two digital receiving circuits are connected in parallel through a digital chip, and finally output to the signal generating circuit, and the signal generating circuit determines whether the generated control signal is the first control signal or the second notification signal based on the AND / OR logical relationship.

[0036] In the above embodiment, by connecting the multi-strip cutting system with multiple plasma cutting machines, multiple plasma cutting machines can be controlled to perform cutting movements synchronously, thereby avoiding the problem of low cutting efficiency in the prior art, effectively improving cutting efficiency, and reducing production costs. Moreover, the fault signal of the plasma cutting machine can be effectively fed back to the CNC host.

[0037] Example 2

[0038] See also Figure 6 , this embodiment provides a flow chart of a plasma cutting straight strip multi-control method.

[0039] As an example, the method includes:

[0040] S610: Obtaining the on / off status of at least one plasma cutting machine in the plasma cutting machine group through the multi-strip cutting system, and sending a control signal to the CNC host based on the on / off status.

[0041] S620: The CNC host controls the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-strip cutting system.

[0042] S630: The plasma height adjustment controller controls the height of the cutting gun head of the plasma cutting machine in the plasma cutting machine group based on the control signal sent by the CNC.

[0043] It is not difficult to find that this embodiment is a method embodiment corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the first embodiment.

[0044] Example 3

[0045] The embodiment of the present invention further provides a storage medium, on which a plasma cutting straight strip multi-parallel control method is stored, and when the plasma cutting straight strip multi-parallel control program is executed by a processor, the steps of the plasma cutting straight strip multi-parallel control method described above are implemented. Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0046] Example 4

[0047] See also Figure 7 An embodiment of the present invention further provides an electronic device, comprising: a memory and a processor; the memory stores at least one program instruction; the processor implements the plasma cutting straight strip multi-control method provided in Example 2 by loading and executing the at least one program instruction.

[0048] The memory 602 and the processor 601 are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors 601 and the memory 602 together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor 601 is transmitted on a wireless medium via an antenna, and further, the antenna also receives data and transmits the data to the processor 601.

[0049] The processor 601 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management and other control functions. The memory 602 can be used to store data used by the processor 601 when performing operations.

[0050] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can know all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A plasma cutting straight strip multi-control system, characterized in that: The control system includes: a CNC host, a plasma cutting unit, a multi-strip cutting system and a plasma height adjustment controller, and the plasma cutting unit includes at least one plasma cutting machine; The multi-strip cutting system is bidirectionally electrically connected to the plasma cutting unit, and is used to obtain the on / off status of at least one plasma cutting machine in the plasma cutting unit, and send a control signal to the CNC host based on the on / off status; The first input terminal of the CNC host is connected to the first output terminal of the multi-strip cutting system, and the first output terminal of the CNC host is electrically connected to the input terminal of the plasma cutting unit, and is used to control the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-strip cutting system; The input end of the plasma height adjustment controller is electrically connected to the second output end of the CNC host, and the output end of the plasma height adjustment controller is bidirectionally electrically connected to the plasma cutting unit, and is used to control the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC host.

2. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The multi-parallel straight strip cutting system integrates an arc conversion circuit, a current control circuit and a multi-parallel logic control circuit; The input end of the arc switching circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting machine group, so as to obtain the arc striking current of the at least one plasma cutting machine; The input end of the current control circuit is electrically connected to the output end of the arc switching circuit, and the output end of the current control circuit is electrically connected to the input end of the plasma cutting machine group, and is used to control the current released by at least one plasma cutting machine in the plasma cutting machine group to reach a preset current based on the electrical signal sent by the arc switching circuit; The input end of the multi-parallel logic control circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group, and the output end of the multi-parallel logic control circuit is connected to the input end of the CNC host and the plasma height adjustment controller, and is used to generate a control signal based on the feedback signal of at least one plasma cutting machine in the plasma cutting group and send it to the CNC host and the plasma height adjustment controller respectively.

3. The plasma cutting straight strip multi-control system according to claim 2, characterized in that: The multi-parallel logic control circuit is also used for: When the signals received from at least one plasma cutting machine are all high-level signals, a first control signal is generated and sent to the CNC host and the plasma height adjustment controller respectively; When there is a low level signal in the received feedback signal from at least one plasma cutting machine, a second control signal is generated and sent to the CNC host and the plasma height adjustment controller respectively.

4. The plasma cutting straight strip multi-control system according to claim 3, characterized in that: The CNC host controls at least one plasma cutting machine in the plasma cutting machine group to be in a walking cutting state at the same time based on the first control signal; The plasma height adjustment controller receives a cutting gun voltage of at least one plasma cutting machine in the plasma cutting machine group based on the first control signal, and controls the height of the cutting gun based on the voltage; The CNC host controls at least one plasma cutting machine in the plasma cutting machine group to be in a non-walking cutting state at the same time based on the second control signal; The plasma height adjustment controller is placed in a non-operating state based on the second control signal.

5. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The multi-parallel logic control circuit is used to generate control signals through AND or digital logic control based on the on-off signal fed back by at least one plasma cutting machine in the plasma cutting machine group and send them to the CNC host and the plasma height adjustment controller respectively.

6. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The control system also includes a material table, and the third output terminal of the CNC host is electrically connected to the material table, and is used to control the workpiece to be processed on the material table based on the control signal sent by the multi-strip cutting system.

7. The plasma cutting straight strip multi-control system according to claim 2, characterized in that: The arc switching circuit includes a first operational amplifier U1A, a second operational amplifier U1B, a first transistor Q1, a second relay KD2 and a second indicator LED2. The positive input end of the first operational amplifier U1A is connected to at least one plasma cutting machine through a first resistor R1. The reverse input end of the first operational amplifier U1A is connected between the output end of the first operational amplifier U1A and the second resistor R2. The first capacitor C1 is connected in parallel to the output end of the first operational amplifier U1A. The output end of the first operational amplifier U1A is connected to the second resistor R2. At the positive input end of the second operational amplifier U1B, the reverse input end of the second operational amplifier U1B is connected to the +15V voltage through the third resistor R3, the output end of the second operational amplifier U1B is connected to the base of the first transistor Q1 through the fifth resistor R5, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the second relay KD2, the second relay KD2 is connected to the +15V voltage via the seventh resistor R71, one end of the eighth resistor R8 is connected between the seventh resistor R71 and the +15V voltage, and the other end is connected to the second indicator light LED2.

8. The plasma cutting straight strip multi-control system according to claim 2, characterized in that: The current control circuit includes an optical coupler U2, a second transistor Q2, a first relay KD1 and a first indicator light LED1. The first pin of the optical coupler U2 is connected to a +15V voltage through a ninth resistor R9, the second pin is connected to the output end of the arc circuit, the fourth pin is connected to the +15V voltage, the third pin is connected to the base of the second transistor Q2 through a tenth resistor R10, the collector of the second transistor Q2 is connected to the first relay KD1, the emitter of the second transistor Q2 is grounded, the first relay KD1 is connected in parallel with the third diode D3, the first relay KD1 is connected to a +15V voltage via a twelfth resistor R121, one end of the thirteenth resistor is connected between the twelfth resistor R121 and the +15V voltage, and the other end is connected to the first indicator light LED1, and the other end of the first indicator light LED1 is grounded.

9. The plasma cutting straight strip multi-control system according to claim 2, characterized in that: The multi-parallel logic control circuit includes N signal receiving circuits, N digital chips and a signal generating circuit, wherein the first signal receiving circuit and the second signal receiving circuit are connected to the input end of the first digital chip, and the output ends of the N digital chips are connected to the signal generating circuit; The signal receiving circuit includes an inverter, a third transistor Q3 and a third indicator light LED3, and the signal generating circuit includes a third relay J1, a fourth transistor Q4 and a non-inverting buffer.

10. A plasma cutting straight strip multi-control method, characterized in that: The method is applied to the plasma cutting straight strip multi-control system according to any one of claims 1 to 9, and the method comprises: Acquiring the on / off status of at least one plasma cutting machine in the plasma cutting machine group through the multi-strip cutting system, and sending a control signal to the CNC host based on the on / off status; The CNC host controls the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-strip cutting system; The plasma height adjustment controller controls the height of the cutting gun head of the plasma cutting machine in the plasma cutting machine group based on the control signal sent by the CNC.

Images